package thread;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 线程池
 * 主要解决两个问题:
 * 1.重用线程
 * 2.控制线程数量
 */
public class ThreadPoolDemo {
    public static void main(String[] args) {
        //创建线程池
        //创建固定大小的线程池，容量为2(内部有两条线程)
        ExecutorService pool = Executors.newFixedThreadPool(10);//线程池
        for (int i = 0; i < 50; i++) {
            Runnable r = new Runnable() {
                public void run() {
                    Thread t = Thread.currentThread();
                    System.out.println(t.getName()+":正在执行任务...");
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {
                    }
                    System.out.println(t.getName()+":执行任务完毕!");
                }
            };
            pool.execute(r);//执行
            System.out.println("指派一个任务给线程池.");
        }
        //pool.shutdown();//关闭
        pool.shutdownNow();//中断
        System.out.println("线程池停止了");
    }
}
